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Testing Combination Sum Algorithm Implementation in javascript-algorithms

This test suite validates the combinationSum algorithm implementation which finds all possible combinations of numbers that sum up to a target value. The tests verify various scenarios including single number combinations, multiple number combinations, and edge cases where no valid combinations exist.

Test Coverage Overview

The test suite provides comprehensive coverage of the combinationSum functionality.

Key areas tested include:

Single number repeated combinations
Multiple number combinations for target sum
Cases with multiple valid combination paths
Edge cases with no valid combinations
Empty input array handling

Implementation Analysis

The testing approach uses Jest’s describe/it pattern for structured test organization. The implementation validates both simple and complex number combinations through explicit test cases using Jest’s expect().toEqual() matcher for array comparison.

Technical patterns include:

Array equality testing for nested arrays
Multiple assertions within single test block
Edge case validation

Technical Details

Testing infrastructure includes:

Jest testing framework
ES6 import/export syntax
Array-based test assertions
Deep equality comparison for nested arrays

Best Practices Demonstrated

The test suite exemplifies several testing best practices.

Notable practices include:

Clear test case organization
Comprehensive edge case coverage
Consistent assertion patterns
Single responsibility principle in test cases
Descriptive test naming conventions

trekhleb/javascript-algorithms

src/algorithms/sets/combination-sum/__test__/combinationSum.test.js

            
import combinationSum from '../combinationSum';

describe('combinationSum', () => {
  it('should find all combinations with specific sum', () => {
    expect(combinationSum([1], 4)).toEqual([
      [1, 1, 1, 1],
    ]);

    expect(combinationSum([2, 3, 6, 7], 7)).toEqual([
      [2, 2, 3],
      [7],
    ]);

    expect(combinationSum([2, 3, 5], 8)).toEqual([
      [2, 2, 2, 2],
      [2, 3, 3],
      [3, 5],
    ]);

    expect(combinationSum([2, 5], 3)).toEqual([]);

    expect(combinationSum([], 3)).toEqual([]);
  });
});